Apparatus for generating high-temperature steam

ABSTRACT

A generator of a free flow of superheated steam in a duct comprises a boiler with means for maintaining constant water level therein and a steam outlet duct leading from the boiler through a superheating chamber having electric or other heating means for superheating the steam passing through the duct in the superheating chamber.

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ite States Patent Sanders ....l22/4 X Crowell............ .....................l22/4 X 122/460 X Gale Winogradow......................

Primary Examiner-Kenneth W. Sprague Attorney-Emory L. Groff and Emory L. Groff, Jr.

[22] Filed:

[21] Appl.No.:

ABSTRACT [30] Foreign Application Priority Data June 18, 1969 Great Britain........

A generator ofa free flow of superheated steam in a duct comprises a boiler with means for maintaining constant water level therein and a steam outlet duct leading from the boiler through a superheating chamber having electric or other heat- 606 7 7 m 30 26 Am "4 2 2 2 m2 l I J mwh c .e S L li W smfm UIF 1]] 21-8 555 References Cited ing means for superheating the steam passing through the duct in the superheating chamber.

UNITED STATES PATENTS 122/460 X 1 Claims, 1 Drawing Figure PATENTEU JANZS 1%?2 MWE/V Tag APPARATUS FOR GENERATING HIGH-TEMPERATURE STEAM DESCRIPTION OF INVENTION This invention concerns apparatus for generating high-temperature steam for miscellaneous purposes in which free-flowing steam at a high temperature is required. The temperature herein referred to as high temperature" is a temperature exceeding that emanating from boiling water usually in the region of 212 F. There are many industrial and other occasions in which free flowing steam at a high temperature is required, and one is to be found in solvent recovery plants such as set forth in prior US. Pat. No. 3,368,325.

According to the present invention, apparatus for generating high-temperature steam in a free-flowing state comprises, in combination, a cold water preheating chamber adapted to be fed with cold water up to a controlled level, said preheating chamber having means to raise the temperature of the cold water fed thereinto to at least boiling point of the water, a superheating chamber communicating with the steam outflow duct from said preheating chamber through which superheating chamber the temperature of the steam is raised to a temperature above the boiling point of water, the said superheating chamber having an outflow duct to transfer the superheated steam to a source utilizing the same.

In order that the said invention may be readily understood an embodiment thereof will be described in greater detail with the aid of the accompanying diagrammatic drawing.

The FIGURE on the drawing shows a diagrammatic view of the steam generator. In the said embodiment, as illustrated, there is shown a water cistern 11 with a ball cock float-controlled supply thereto maintaining a water level 12. The tank lll feeds cold water through a duct 13 to a cold water preheating chamber 14 wherein the level 12 is maintained. There is an electric immersion heater 15 located in the chamber 14 energized by the electricity supply 16. This raises the temperature of the water in chamber 14 to at least-boiling point (2l2 F.). The steam from the preheating chamber M passes out from the top outlet duct 17 which leads to and passes through a superheating chamber 18 heated by an electric element indicated at 19 by the supply 116 capable of raising the steam temperature to a higher temperature, e. g., approximately 300 F. The superheater steam is then conducted by a suitable duct 20 to a source utilizing the same. For example the apparatus 21 indicated by the dash lines can be a solvenbrecovery apparatus of the character described in prior US. Pat. No. 3,368,325 where water and solvent issues from the base to a suitable separator. The valve F is equivalent to the valve bear ing the numeral 8 in the said prior specification. Reference is directed to the latter specification for further enlightenment, such an earlier apparatus forming no part of the present invention, but for ready identification 23 is the closed chamber referenced 7 in the former case and 24 is the cock 20 of the older case.

1. Apparatus for generating a free flow of superheated stream, comprising a water-heating chamber, a cold water supply vessel on substantially the same level as the water-heating chamber, a feed pipe leading from the bottom of the cold water supply vessel to the bottom of the water-heating chamber, a water inlet to the cold water supply vessel, and a float valve for controlling the cold water inflow through said water inlet to maintain a substantially constant water surface level in said vessel and in said water-heating chamber, a first heat source for heating the water in the water-heating chamber to at least boiling point, a superheating chamber, and an outflow duct leading from the top of the interior of the water-heating chamber and through the superheating chamber, and a second heat source operative upon the duct in the superheating chamber to raise above boiling point the temperature of the steam flowing freely in the duct. 

1. Apparatus for generating a free flow of superheated steam, comprIsing a water-heating chamber, a cold water supply vessel on substantially the same level as the water-heating chamber, a feed pipe leading from the bottom of the cold water supply vessel to the bottom of the water-heating chamber, a water inlet to the cold water supply vessel, and a float valve for controlling the cold water inflow through said water inlet to maintain a substantially constant water surface level in said vessel and in said water-heating chamber, a first heat source for heating the water in the water-heating chamber to at least boiling point, a superheating chamber, and an outflow duct leading from the top of the interior of the water-heating chamber and through the superheating chamber, and a second heat source operative upon the duct in the superheating chamber to raise above boiling point the temperature of the steam flowing freely in the duct. 